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Is Frank Sinatra the father of Mia Farrow’s son Ronan Farrow? (Picture: CinemaPhoto/Corbis)

Ronan Farrow has laughed off claims he could be Frank Sinatra’s son after his mother Mia Farrow hinted they share the same DNA in a new interview.

The Rosemary’s Baby actress admitted her biological son with Woody Allen could well be Sinatra’s child as she confessed they’d never done a DNA test on her 25-year-old lawyer, journalist and human-rights activist son.

Admitting Sinatra was the great ‘love of her life’, she told Vanity Fair: ‘We never really split up’.

Frank Sinatra and Mia Farrow married in 1966 (Picture: File)

They were married for two years between 1966 and 1968 but continued a romance for many years.

Ronan was born in December 1987, meaning Frank, who died in 1998 when he was 82, would have been in his early 70s had he fathered him.

But tweeting his dismissal of the reports, Ronan said yesterday: ‘Listen, we’re all *possibly* Frank Sinatra’s son.’